N.H. Rev. Stat. § 622:37-a
The warden or director of each state correctional facility and any facility listed in RSA 169-B:14, I(c) or (e) shall provide sufficient menstrual hygiene products to individuals who are in the custody of the state who biologically menstruate, at no cost to such persons. Sufficiency shall be considered, at minimum, a combination of 20 standard issue menstrual hygiene products per individual's menstrual cycle. An individual may request additional menstrual hygiene products based exclusively on their cycle at no cost at the discretion of the commissioner, or designee. The number of menstrual hygiene products kept in a cell shall not be excessive so as not to create safety or security issues and shall only be used for the intended purpose. As used in this section, "menstrual hygiene products" means tampons, menstrual pads, sanitary napkins, and pantiliners.
RSA 622:37-a